28938775 has 12 divisors (see below), whose sum is σ = 35950824. Its totient is φ = 23108000.

The previous prime is 28938769. The next prime is 28938787. The reversal of 28938775 is 57783982.

It is not a de Polignac number, because 28938775 - 2⁹ = 28938263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25980 + ... + 27070.

It is an arithmetic number, because the mean of its divisors is an integer number (2995902).

Almost surely, 2^28938775 is an apocalyptic number.

28938775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28938775 is a deficient number, since it is larger than the sum of its proper divisors (7012049).

28938775 is a wasteful number, since it uses less digits than its factorization.

28938775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2162 (or 2157 counting only the distinct ones).

The product of its digits is 846720, while the sum is 49.

The square root of 28938775 is about 5379.4772050823. The cubic root of 28938775 is about 307.0153203529.

The spelling of 28938775 in words is "twenty-eight million, nine hundred thirty-eight thousand, seven hundred seventy-five".